JPH0158710B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to an apparatus for reliably transporting originals one by one in an electronic file facsimile machine or the like and reading both sides of the originals.

<Prior art> Conventionally, automatic document reading devices have been designed to pick up a document with a paper feed roller or the like, separate it one by one using a friction member, etc., and then sandwich the documents between a pair of rollers and convey them one by one. However, those that read manuscripts are common and widely used.

Devices that use friction members, roller pairs, etc. use friction to carry out conveyance, so it is difficult to prevent double feeding, the document is easily damaged, and the surface of the document is stained.
It has many drawbacks, such as slippage on art paper or coated paper with a low surface friction coefficient, and meandering caused by unbalanced roller shapes during the conveyance process.

<Object of the Invention> In view of the above-mentioned drawbacks, the present invention realizes an improvement in the effect of preventing double feeding, and also provides a compact and highly reliable double-sided paper that does not stain or damage documents or cause feeding errors. The purpose is to provide an automatic document reading device.

<Embodiment> The double-sided document automatic reading device of the present invention will be described in detail below with reference to the drawings showing an embodiment of the present invention.

FIG. 1 is a schematic perspective view of a double-sided automatic document reading device according to the present invention, FIG. 2 is a schematic front view thereof, and FIG. 3 is an explanatory diagram for explaining the operation of the present invention. Identical parts are given the same reference numerals.

In the figure, reference numeral 1 is a document reading device, and reference numeral 2 is a platen glass. Reference numeral 10 denotes a casing having therein a paper feed base plate 11, a document suction device 12, a double feed prevention device 13, a double feed prevention claw 14, etc. shown in FIG. The paper feed base plate 11 is driven in the direction of arrow A, and the double feed prevention device 13 is driven in the direction of arrow C by respective drive devices (not shown). Further, the document suction device 12 is rotated in the direction of arrow B by a rotation device (not shown), and the double feeding prevention claw 14 is rotated in the direction of arrow D by a solenoid and a spring member (not shown). As shown in FIG. 3, a bent portion is provided at the tip of the double-feed prevention claw 14. Further, suction ports are provided at the bottom of the document suction device 12 and at the tip of the double-feed prevention device 13, respectively, and are connected to a suction device (not shown), so that the document is suctioned by these suction ports. Reference numeral 20 indicates a main support 21, an arm 22,
Original grip plate 23, paper ejection support 24, paper ejection claw 25
This is the casing of the document feeder GF, which is composed of the following. Arrow E is driven by a drive device (not shown).
An arm 22 is provided on the main column 21 which can be freely moved in the direction, and is rotated in the direction of arrow F by a rotation device (not shown). The document gripping plate 23 provided on the arm 22 is rotated in the direction of arrow G, and the paper discharge claw 25 provided on the paper discharge column 24 is rotated in the direction of arrow H, respectively, by a solenoid and a spring member (not shown). A document pressure plate driving device 30 is provided in the casing 20, and drives a document pressure plate 31 in the direction of arrow I via a pressure plate mounting block 32. Further, the document pressure plate 31 is rotatable in the direction of arrow J, and can be used to handle thick booklets or the like by manual operation.
Reference numeral 40 denotes a cover rotatable in the direction of arrow K, which is attached to the document feeder GF, and is provided with a reversal assisting bar 41 that is rotatably provided as shown by arrow L. Reference numeral 51 denotes a document storage tray, which is attached to the document reading device 1 via a tray mounting block 52. The document storage tray 5
1 is set to receive the document to be accommodated at a certain height by a spring member 53. 62 is an optical original reading section.

The document reading device 1 can be easily removed from the automatic paper feeding section, which is composed of the document suction device 12, the double feeding prevention device 13, the document feeding device GF, etc., and the document reading device 1 and the document pressure plate 31 are This is a so-called manual device in which the original is set and read by hand. That is, it is easy to change from a manual device in which documents are manually set to an automatic reading device having the automatic paper feeding section. Furthermore, other parts of the automatic reading device, such as the document suction device 12 and the document feeder GF, can be easily separated as a unit, making repairs and the like easier.

Next, the operation of the double-sided automatic document reading apparatus according to the present invention constructed as described above will be explained with reference to FIG.

Reference symbols P, P' and P'' in the figure are original documents.

First, when an instruction is given to start reading a document, the double-feed prevention claw 14 rotates to a predetermined position, and at the same time, the document suction device 12, which was in the standby position, rotates to a predetermined position, and then the paper feed base plate 11 is moved to a predetermined position. (a). Next, the document suction device 12 uses the suction port provided on the bottom surface to suction and pull up the uppermost document P to a predetermined paper feeding position shown in FIG. At this time, if the document you are trying to pull up cannot be attracted due to some reason (for example, suction force between sheets due to static electricity, etc.), increase the suction force,
By repeating the suction operation again, the document is reliably suctioned. Whether or not the document has been suctioned is determined using a pressure detection means (not shown). When the above operation is performed, the double feeding prevention claw 14 partially catches the corner of the document being pulled up by the document suction device 12, so that the uppermost document P to be fed and the next document P are separated. If the adhesion force between the sheets due to static electricity or the like acting between the two originals P' is relatively weak, it serves to prevent two originals from being pulled up by the original suction device 12 at the same time. At this time, if the adsorption force between the sheets acting between the uppermost original P and the next original P' is extremely large, the double feeding prevention claw 14
In some cases, two or more pieces may be pulled up at once because they cannot be separated. In this example, the document P′ which is the next highest document and the document P″ which is the next highest document are shown separated.Document suction device 12
finishes the document suction operation, and then the double feed prevention claw 14
returns to the standby position, the suction port at the tip of the double feed prevention device 13 starts suctioning, continues the suction operation and moves forward until the document suction device 12 approaches the bottom surface of the document P' that is being suctioned. It sucks the document P', moves back slightly to a predetermined position, and then stops the suction operation. After the document P' is separated from the suction port of the double-feed prevention device 13, the double-feed prevention device 13 returns to the standby position (d in the figure). Therefore, the original P' falls onto the original P''.
In addition, if only one document is attracted to the document suction device 12, the suction force of the double feed prevention device 13 is set to be weaker than the suction force of the document suction device 12. There is no inconvenience to withdraw money. Detection of whether or not the double feed prevention device 13 has attracted a document is performed using a pressure detection means (not shown), as described above. If there are two or more originals, the suctioned originals are removed sequentially or all at once by this operation, and the double-feed prevention device 13 continues until the number of originals suctioned by the original suction device 12 is one. The above operation is repeated until only the top original P to be transported is left. At this time, the document feeder GF is in the standby position and is not in operation. Next, after confirming with the detection means that the uppermost document P to be conveyed by the document suction device 12 has been lifted up, as shown in FIG.
A solenoid (not shown) opens the document gripping plate 23, and the document conveyance device GF further starts moving forward (movement in the direction of arrow E in the figure). This forward movement stops when the edge of the uppermost document P is detected by a document edge detection sensor (not shown) provided on a part of the document holding plate 23, and the solenoid is released. Due to the action of a spring member (not shown), the document gripping plate 23 is closed as shown by the broken line in FIG. The uppermost original P held between the original holding plates 23 in the manner described above is conveyed in the direction shown by arrow E in FIG. I am made to do so. This operation is performed by a position detection means (not shown). Then, in order to make it easier for the reading surface of the original to come into contact with the upper surface of the platen glass 2, the original holding plate 23 is rotated by a certain angle by a drive device (not shown) while holding the original P. That is, the tip of the document gripping plate 23 is connected to the platen glass 2.
It rotates until it comes into almost contact with the upper surface of (g in the same figure), and is stopped by a position detection means (not shown). Thereafter, the document pressure plate 31 is lowered (g in the same figure), the document P is pressurized, the image reading operation of the document P is performed by the document reading device 1, and after the reading operation is completed, the document pressure plate is raised (in the same figure). Figure g). As shown in FIG.
The document is rotated around the document and the document is reversed. The inverted original P is conveyed to the back side reading position of the original as shown by i in the figure. Here, as described above, the document pressure plate 31 is lowered with the tip of the document gripping plate 23 almost in contact with the upper surface of the platen glass 2, and the back image reading operation of the document P is performed, and then the document pressure plate 31 is raised. (Figure j). The arm 22 then rotates in the direction of the arrow F and enters the state shown in the figure k. During this rotation, the document holding plate 23 is opened by a solenoid (not shown) and the document P is placed on the platen glass 2.

Next, the document feeder GF returns to the standby position, and in the same procedure as described above, the end of the next document P' is placed on the document gripping plate 2.
3, the document P' is conveyed in the direction shown by arrow E in FIG. At this time, the paper discharge claw 25 is rotated in the direction indicated by arrow H in FIG. 1 by a solenoid (not shown). Therefore, when the original P' is conveyed to the original reading position, the original P on the platen glass 2 is accommodated in the tray 51 by the ejection claw 25. (Figure m). At this point, the solenoid described above is released and the paper discharge claw 25 is pulled up by a spring member (not shown). Thereafter, the document having images on both sides is read in the same manner as described above, and the next conveyance operation begins.

Also, when one side has been read, the document gripping plate 23
Needless to say, if you open the document and place the original on the top surface of the platen glass 2 and start the next conveyance operation, you can read only one side.

<Effects> As described above, according to the double-sided document automatic reading device according to the present invention, the double-feed prevention effect is improved by the functions of the double-feed prevention claw, the double-feed prevention device, etc., and the document is grasped and conveyed. Unlike conventional devices that use friction members to transport originals, this system reliably transports originals without staining or damaging them, and automatically reads both sides of the original, even if the original has images on both sides. be able to. Furthermore, by making each device into a unit or block, repair and maintenance of the device becomes easier.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of a double-sided automatic document reading device according to the present invention, Fig. 2 is a schematic front view thereof, and Fig. 3a
1 to 2 are explanatory diagrams for explaining the operation. DESCRIPTION OF SYMBOLS 1... Original reading device, 11... Paper feed base plate, 12... Original adsorption device, 13... Double feeding prevention device, 14... Double feeding prevention claw, 21... Main support, 22... Arm, 23
... Document gripping plate, 24 ... Paper ejection support, 25 ... Paper ejection claw, 31 ... Document pressure plate, 41 ... Reversing auxiliary bar, 5
1... Original storage tray, 62... Optical original reading unit,
P, P′, P″…Manuscript.

Claims (1)

[Claims] 1 a document reading device having a document reading surface on the top surface;
a document pressure device that presses the document from above when reading the document placed on the document reading surface of the document reader; A paper feed plate is configured to be movable up and down in order to move the uppermost original to approximately the same height as the original reading surface, and when the uppermost original on the paper feed plate is lifted, A double-feed prevention claw is provided at the upper end corner on the document reading device side so that its bent end is caught, and a suction port located on the bottom surface of the document is located above the document on the paper feed base plate. A document suction device includes a document suction device that suctions the uppermost document on the paper feed base plate and lifts it above the bent portion of the double-feed prevention claw; The device moves between a nearby position opposite to the bottom surface of the original document and a predetermined position below the position, and also adsorbs the bottom surface of the document at the nearby position, peels off the overlapping document, and prevents double feeding of the document. a double-feed prevention device that prevents double feeding, and a device that grips the end of the document suctioned by the document suction device on the side of the reading device, transports the document to the document reading surface, and inverts the document and positions it again on the reading surface. A double-sided document automatic reading device equipped with a document conveying device equipped with a reversing mechanism.